ezplot('x^2+y^2-4',[-3,3,-4,4])
hold on 
grid on
h=ezplot('10*x^2+y^2-9',[-3,3,-4,4]) %defineerime h
%muudame h omadusi
set(h,'Color','r') %joonevärv punane
legend('x^2+y^2=4','10*x^2+y^2=9')
title('Joonis 1')